Just last year, Koch and his wife were revealed as the buyers of Joseph Chetrit’s $40.25 million Upper East Side Mansion. The New York Post reported that, according to sources, they paid for it in cash.

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Koch was a familiar face in the world of New York real estate. According to the real-estate news platform Bisnow, along with the 15,000-square-foot townhouse, Koch also laid out $17 million in 2004 for an 18-room duplex in a luxury apartment building on Park Avenue.

In 2017, Business Insider reported that Koch owned a seven-bedroom home on Meadow Lane in Southampton, which Forbes once dubbed “Billionaire Lane.”